I wonder why some enterprising company hasn't starting making an aftermarket IRS for the large Prairies. Come to think of it, couldn't you use the IRS off of an Arctic Cat?

 

You could make a kit but it would be $$$$$!!! More than it is really worth (at least I think so). As for the cat, it has a different frame so it may be a large project to convert it over plus a LOT of factory parts. I am sure you could if you want to invest the $$$.
Good luck!